First of all. thanks to all the techs that post on this forum for three months of the best MB education that websurfing could ever buy. I've only owned my 300E for ten months and am truly a "babe in the woods" here.

My 1992 2.6 300E has always cranked on the first try and never had even a burp on idle or acceleration even driving in 100 degree weather here in Jax with the A/C on high. The other day it cranked but didn't catch. Not even close to starting.

My mechanic came over and attempted diagnosis. The fuel pump activates with the key. Fuel comes up through the fuel distributor seemingly with appropriate pressure. The "fuel governor" appeared to be leaking, however, so we changed it. No difference. The fuel distributor appeared to have a stuck "piston" in the underneath center which we freed. No difference.

Where should I go from here? Could it still be a fuel pressure problem related to the fuel pump? Or something more sinister?